Multistate Model Bias-Corrected Robust Variance R package mmbcv version 0.3.0 Computes robust and bias-corrected sandwich variance estimators for multi-state Cox models with clustered time-to-event data. The methodology extends the marginal Cox model bias-correction framework of Wang et al. (2023) <doi:10.1002/bimj.202200113> to the multi-state setting. Software Depends: R (>= 3.5.0) Suggests: knitr, rmarkdown, survival, testthat (>= 3.0.0) Can Meng <can.meng@yale.edu> Comprehensive R Archive Network (CRAN) Can Meng [aut, cre], Denise Esserman [aut], Fan Li [aut], Erich Greene [aut] MIT + file LICENSE (https://CRAN.R-project.org/package=mmbcv/LICENSE) 2026-03-31 application/tgz https://CRAN.R-project.org/package=mmbcv doi:10.32614/CRAN.package.mmbcv